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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed732b906b3d45096b9178cb677a9a04d0b5061addb2ee6a7e4e420de757022e' 
  AND token = 'K0ANpJqSH8xY/Zoyle5NZ8urxL7O7sAj/xMqjmAKr8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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