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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08df2ef003433acf926d7a61d7c3468d2b104f339bfce64729f5746af2ae5b2' 
  AND token = '60TG8cwhR/KfSr4LAYr7ATW/LFE00NyqmiFxcRt0/os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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