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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251e211c7117001a59aa37af77d475fcafc779665b1246465f72f5b293eb997b' 
  AND token = 'Q6l4DZHD40A/i7Er6PI1t+rFEXEloCx7rxs1OK3/jAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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