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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f637f7c3489b8f796cf86a1a84c2782e351ba870239d0ab9dfec134239b61429' 
  AND token = 'FQlFdEt18/5dSx8kl2ng8C987wpdeQ3MabbrE40wLDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}