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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23b54bd796c3b15d0c43efb3dfc0ec1602a197655243c4960ae40bb671dba59' 
  AND token = 'AiXFYJaq5AqOGDCpRcNBO5jGLyLonaA2Q36w4q8jvI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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