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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8411ce89e4a4cbe630c7d236dcfd4ec4c1c98a2154ec21c6ccedc3b0cf583cd8' 
  AND token = 'AH+sE7/OD3ReiMVaBIqcP2WoeI8HhXA7naapO/34cow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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