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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3d1ea4bba0e42cd2d0a86c5e88ab1af7909f8f9e0c2a198d681dd2c182d629' 
  AND token = 'RSJmpHkRJ+XPA/6TyQIYivH07nMqZlEJXzOMpGkBfd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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