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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7f0e0fb4ee24b517bfd95f0d80e3cb5974a4ac67eb251e2cdd6fee78691810' 
  AND token = '9inmOVy9oE7erqcVevJ+/jS2x2A8VQ3gXLXqvssC6Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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