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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5924d02d970fbc6485671e2523bd06430ba6ed690c1de468fc8449f501396009' 
  AND token = 'Li1xo8QvkipdutBEEcGoc/S4Cz2rIwttIPpLFy3507o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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