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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfb8c17cf005a2ef9c105721d7df4be2a4136eb9a0bf2e2846a6d97e47c6743' 
  AND token = 'VOAKHjtQNELkse27Q73k3+tqubzRpDVah9jksQ9v8lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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