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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdb4242e749746c76caa48e5efe444f9413cfcdfe4ec7a95c0aff4a45a83854' 
  AND token = 'Nr/RN7Z5bzrX/cmkUE2hHgIbRSbIknPKhr2w8juB5WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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