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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8799ac55649a23982028e7bd296cb666cdba4b1fa839cbf4d9d5d72004beb6d2' 
  AND token = 'oX0qEs4BTzV9pKVgh3Yz+6jnpS7QicZdCc6n3uqxtag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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