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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf0b36b7acafd1a122309e3cc273be14ff9f924233b579942070a67ab74c47f' 
  AND token = 'oj8ES51J8bL+nTtb4gQ87U7pg6H9UkZZ/P/iyz9Z8cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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