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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f85ef0f3b770b5527c30f2585810300dcb8da9553a98199f4283da78ae3410' 
  AND token = 'Rm4Tz66oFoO+FvjVWQzZfQ3HiFmTHHI6xg+pFvoItAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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