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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee40422efebd0248fad38f25441bd4370fe1dd9c1dd59980435e5ca9e290e0be' 
  AND token = '7sAAd6PW5/3YtSAKCU1cszqZyofOWazIViVF2xaWEVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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