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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0274f532752fe63d738b40cba87fa02c4fb4b8f0bb8d7ede51689d2f8914a1' 
  AND token = 'PUaGtW1rOrdPfClpZzmme7qjCD4LHdYua9E5bqzIenY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00167

JSON explain

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