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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c7d5cd97dc61363cbf5d9fb7cf5f82b6d3063b640bb294eef20f3b5eceaf9c' 
  AND token = 'ekJqpk3yobV7mu+0ZRhnNwYrOc8ya9sUCHtzTKpq2Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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