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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bff26235966e86d88a8f8a1bcce39ac28ecfaacd39b20f82dc7e4f29a4e2739' 
  AND token = 'XvQJAUmPTaSGV+VxDkVJ7HP2vACooSBNHMOknGxGVI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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