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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b59ad30ab968b92433c5da848d012854b919ef361a3acc832454b19842a7cd5' 
  AND token = 'KM/YK200W6a5WwZ9ijoJgB8dnAA++5dou/Dmzi5CWGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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