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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad80821821cb8ab211f054bc3123a4d667fb911500257690ed99670ca0efde1' 
  AND token = '92bqulrvrHsMXAJZsDM0sKj1n6tgJWyxD5LWemvyUhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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