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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815bb6946dc969c6442b77349db51b764ea83b1e1e08b99213a83fe57c4475e5' 
  AND token = 'yga08OAMMoNfP91VKWV0SAOqHN5U4kaWaV6RfLkbnIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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