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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82067242925d72563d62041afe11258d5ed3f51453dbb97d010ee963a8e3815a' 
  AND token = '4x9VeaUineHS+VAzUi2/hC16TBcMYzQFqX/eJs8vRQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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