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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520f74342b7b999bb7b223527226018c0818c70ecf7963b02fb855d680afed6f' 
  AND token = 'xwX1CxKiABGTjRuSqOMyr06H+8r6MupOMjEAOiDno8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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