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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6e32929e65d91611b8842a753842875c1e6b334e705bf1180ced93a45793bc' 
  AND token = 'eT0HPApKJC8ReylNupqVbAGgf4YtArn2puARTBbCk74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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