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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5edf36e424405c264d61885a940ecd826d9ba803f4fffd871b43cb510e03dd' 
  AND token = 'YxAgXWcy3r52ljp6r6wB9YrOoQkHOLccEDODogmpeJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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