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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf177dba10a98ec80f54cdae23b07e03c0aecd348e70c250f1b76313a052b4e0' 
  AND token = 'sHjeuWe23FJ1g7WHyIgMM63mCVVnim9vjHx/FuR3ttg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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