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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd362974e45b7e05e8a5f172e691358b7e79e001b5e1765bff8d15abcad91cd3a' 
  AND token = 'Vg4MCBPfQ+58msDU+uMGavQmYq2ui2Jg7n/3c3ndEsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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