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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f10cd008ebb36a4c797e755e1b7a2817a4458eccd6627dec7b49f8606ff511b' 
  AND token = 'F4D5hB+jd69WW3d/QK5MffXYgD9Hh1ghyShRKfCnC1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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