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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96adbdf023b9d0ec96213e01dc1954b5f314f06cb85ebb549df5e2ebc671e41d' 
  AND token = 'Un175UsNSu7XsOB/uUVf2ku9w2Jy8K+bDr9o7C2TCuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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