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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cff765c80e6e82116607ab90790db1f9f47e268bf4b14b2aebeb58d5cc82a0a' 
  AND token = 'fXyZOgkIa9NRiZMiws3pO6fdMO+DZ1SOqhI76Wr9l9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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