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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7119386c1b6d81107131ca942db6c72cbe7f01c8031d7d9195912ec95a8c5a' 
  AND token = 'MMYG85zt6vgh1SZ/YH8qjR4VcFkgP3WdHwTC8/fgF1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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