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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdee02262c914aaaa657f1b708f9c5159821e61cb41e506b0a22e2d80e469759' 
  AND token = '+uz3AyVY5DlNCki3doF6/viO3l91QMjhivYzIkX6vq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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