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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948e8e4ff21cb802a8b682dd0b2750ed6821d06a0377477bb2e195b4f8da5316' 
  AND token = '6i8GspPkEMWfpISzglQymh+qylRVNGLRSAaz8xmrcBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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