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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f59d32d14f4e0b5bcd5b626353707746786757808754f8739d540fff6d9e38' 
  AND token = '/0PPObLsN42FBZ+Zrlprp/DrtR+oawG5ukOQnIsDGNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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