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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75f8bb38e478a2242b7cfe58b7aafddbaad83a0b3713e9d9d4678da231f4bc0' 
  AND token = 'PmUlX+NtrpU8UWyCpLI7Ew2r38cJlO5CP0pKc93jBAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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