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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d6d5224840079a00de5f41fc6c7372833865b12870cf1e83c8e0f65cb4a961' 
  AND token = '0dcHMw9Hs1DtVKJR2VsGt/yXpt1nj4BCv7d45OtCE7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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