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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8791d558ada5617b48286998cb3368276994acaf9598f3af5a11e004741db1c2' 
  AND token = 'fT+9ydSAvi4o5PrSdwF3awS+/dAM/IaSiJJk1JzJYJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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