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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673ec507fcd29a7fdc60626620e676d47171f2ddc2e7a3c8a2942e9adcf59088' 
  AND token = 'k5Xjlwqfhydptp+EUzRTBo2B7EChNboI30gGLHjyaUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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