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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdf47eacdaffc1ff9becc6708107e5a2a20e1e273414e414ea4a43089ac982f' 
  AND token = 'qSaA5RNNXsJ+sZO7nAzbs4bu8SD3Ilo9hvk9SQ//NtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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