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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911538ca755ae235231529ee9f4c940ec3136f9f8d46d8a01eaa674a11065a4c' 
  AND token = 'dD9xeq4+Vz3+5kgLRdP7CJtr3Yn0J727Z+R3FOWzl3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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