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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8eee991d63d86ece4764a59689b0392a17c5718a60947fed4e1fedac032e3e' 
  AND token = 'nZp3/OVu5RRDalVFP3mw/p1xZ7NsYNTp++X9bO34G3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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