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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765efc67b35879d3fe88d742c5b8e9d5bebdeda307d9f3cb6f7450c16adb6759' 
  AND token = 'lVSk4L4YUCv592RPIUzziWLpf+zz8i08nZv8pW0mhd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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