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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760423fbd98fbf8c17d06877f441dc5855126997ef7ddffeb38ecd0fb6c09de8' 
  AND token = 'A++EGvUu5K5l+he+sArufD3grkMmvUicH1owCVS4bGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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