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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0e2d6915a92936c3c9a16babf10186d5d6cc5c0fea00d85cccc25ca1eb3144' 
  AND token = '4DCJ+lDHx01ghQRTS7w1DouoK5C0Lxd2qJt36YDln3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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