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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c506fddd324baf6a64f6a337e67bf5f8c613087de9573648ccde16d6bf4c82ca' 
  AND token = 'kyWTEDW2Gse1jWHtWO3IPhcCwgqfND1QirAt3AeiviY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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