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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9340cef3a01b393334b87549f451af3f5eed3c97afb900d800a3b89214626e68' 
  AND token = 'RVlU7IyErgMkzzBtP9dqT8CjjFlxEfx8z+az1NjHP5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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