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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2470aec453442f0660dc7b83a566fe03cfa5565dfc4e136f919af9daf57377' 
  AND token = 'E3sEVYlNd/2vTcKKnT/GKQCkYH2bk40HRAG/4G31w80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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