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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fba0a1e965a4151c76c2109c95a24fc46e36e5d84b5818bca452576573c7d0' 
  AND token = 'W41bq51sjuyl23bbGPsFOwQ8z+H9+jhWV0Sgc6ki5qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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