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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3e01b93163556abcf3aa31afb2634f5c1410437dd0e7cc51375b1838256ae1' 
  AND token = 'hObBKAb1Z4hxR4dRRNisJM8KLiytxmyKIWLsEwdcey8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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