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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e98d7d64f2d8cdfffbd3dca9504e6eb65eb82d6c94546b989df117697cca96' 
  AND token = 'w2wMDmHaLQ2kHZ+p665zn2kYBezx1DPj7AUSslE/Y2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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