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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cce702f2b2cfe871b7abee976385b12f35b0493efb9ddd79fe257fb6a9b66d4' 
  AND token = 'YWav38B7NgxDZAxoH0giKvs+EmFFhM37xx7BNgohND4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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