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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964f351481626772d0f2e9e5c77c6ebd304eca09e72c01843647d3b704b79428' 
  AND token = 'sGONo4GpC2btPiO7fjdHZfN9Q+mYnh2V8Ix8gf0zoLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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