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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67803ecb5259a8cda86b2ebfc64795fa9681e323a8ef8bdeebce5787f68ebfe1' 
  AND token = '/O+GriWIvK21IA4SLoap/d+37dbcaXYjdhN2g5skqQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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