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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0efc608a9a3b35665cc08ae62153d79c29a9f5f731c5045c5942bf7deebef3b' 
  AND token = 'VFX6IMhoAfLgAanU4DNGaRPP8vusgnjSUv02ilFogkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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