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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df402f9e6b1955feea96b0f69a4b2fd20b1acbb951510d36c66d289dc5a7bf5a' 
  AND token = 'XB5mLVBaThUs9J+wNXaq855iOsO0iuIniNe4O7pWUrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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