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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9266cdbbba9430f03481876747de13e81eced05918cc66dc24aadde07c8ea64' 
  AND token = 'gGI7byI6E77G4jNr9mAPsg5WVaALpFaHB0q0Ba0rt5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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