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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406ccaac825958abd380e3f09387f4d05590f9ed83c2d1129edf4cf2f26aef2d' 
  AND token = '8WRlQJUL32Ia+m88Biv1RRrHLdNOopn100NZZp/vpSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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