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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e481604dce04e1e2f32608a9862e74ed5db98a37ae8a91b36f534142d2e0be' 
  AND token = 'mn2M3qlKB+BxGauZWr59RRvqkLuOlS/Tq55dwTAGt1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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