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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4677f849e3086ea30de4d585e0f76217b678f9133ebb26fc50c01f9add180015' 
  AND token = '56ufFoEWgZ/Y03HINRZ/zVsRM08bQ8U9KfoJoGu8808=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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