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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62fbbab804ea2bf393770ebd18e17004ad57e08d1b684856a320d30dd20cd59' 
  AND token = '+X9lSFofIWPuFQL+qcbhO0b4zvhCxqNL7CysYX6EaI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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