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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283284805b7a1a18a74eba225092e3d565fda3db9e8eaf3b218f004a62f434e1' 
  AND token = '2vHZp6eAlXtQctd2W6MAB1u+b5DWf8VdJCKC0CusiSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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