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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee1cbd99978532de6aab1f4049cebe80ed4a63e7050125d0531ff86e0469da3' 
  AND token = '9ZDli1pet2zHcJmXtkDX35+2VpWZihz3tYgs8a1jfU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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