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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64028cdc793e63bf4410bfe8cabd1073d3a0814714f8760b315ffb5baccc6465' 
  AND token = 'cJWfqtP0ylZRfRczo2Rxi1l/3wi9QjNvYITe9PHHzv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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