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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbab82593662a4e385e0602c25d3d182c7f7aededf9111ee416db0be6737a45' 
  AND token = 'kNI/v4BMO8WeE/trLYhByrcb4CfdPrBfjTV3ajmyDsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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