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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bb8aef40e9fa28efd8cd3dff390b8b51bdcda385e02cac0da86e50017c6583' 
  AND token = 'Mrvy2fE2nO7ZKVqR181Iz53U9DtO60pmC1l4ct+pSMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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