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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd90648ea7b694c6bfe8c6f63184ec3019096923d7d73bc0f6c444ea027b7f3' 
  AND token = '6/kWEtN+A3Qi5sq+voNBin6Vqb1yEWwRFjqgbB9vy2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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