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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c058a060092f84f7aa2f67e955364c7be037392e7d5b792fee820cdc5e0fc8' 
  AND token = 'qOAcVnC7UKit1YSSKfrORGW6Rw3H9hUIK3EoUDtBiXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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