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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee49c11b8777f5275aeb07e940d46aa836ac799c077ae93542423af0cfa81a82' 
  AND token = 'nQPX96H5C9sWP2LOsT80LLtB2eFsK/cKdiI6j1VK1mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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