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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98cea250713c17a9befb5efdb4296f70ca7ef1f9d1a220dff16410cdd016cb7' 
  AND token = 'HlmM4SaXyz3Paj9wbO935gDT6FLaH+rF+Xcx1GxKu9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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