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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044a59865e2465a5adbc923c5a596c7db91ff10fc3c2ebd508c03c2f278a3296' 
  AND token = '/xeyGd7hWnMXNpTjU4jWLcvIKV4mCdTv5tiKD7+wIhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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